Knife



FIG. 1 is a front elevation view of the design of the present invention for a knife, the rear elevation being identical thereto;

FIG. 2 is a left side elevation view of the knife of FIG. 1, the right side elevation being identical thereto;

FIG. 3 is a top end view of the knife of FIG. 1; and,

FIG. 4 is a bottom end view of the knife of FIG. 1. 

We claim the ornamental design for a knife, as shown and described. 